Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
    For instance, can you write a generator function which returns an iterator function?

My understanding of an iterator function tells me it's code that returns an item from a list -- which sounds like dynamic code. I don't believe C can do that easily.

    What about closures?

C does have scoped variables, where a variable only exists within a pair of braces. When I was writing C code that got cross-compiled to 68000 assembler, I could see that the compiler just assigned space on the stack for that type of variable by moving the stack pointer down, and once the scope ended, the stack pointer was just adjusted back up.

C also has the static keyword, which says the variable is to be stored in the lexical scope, meaning it's created at the beginning of the run (perhaps on the stack, but not anywhere that's going to get re-used), and only initialized once, if that initialization happens during declaration. So my guess is that closures are possible -- but keep in mind I studied engineering and not computer science, so that opinion is just what I've picked up since I left university.

Alex / talexb / Toronto

Thanks PJ. We owe you so much. Groklaw -- RIP -- 2003 to 2013.

In reply to Re^5: What technical benfits perl offers over python + few more questions. by talexb
in thread What technical benfits perl offers over python + few more questions. by Anonymous Monk

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (6)
As of 2022-05-16 14:55 GMT
Find Nodes?
    Voting Booth?
    Do you prefer to work remotely?

    Results (63 votes). Check out past polls.